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nonuser
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Some no or low upvoted posts I think they don't deserve that:

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11
Domination problem with sets
Dec 6, 2018
answer
6
Domination problem with sets
Dec 9, 2018
question
3
Given a positive integer $n$, some straight lines and lattice points such... Prove that the number of the lines is at least $n(n+3)$
Dec 19, 2020
question
2
The drawn diagonals divide the $N\times N$ board into $K$ regions. For each $N$, determine the smallest and the largest possible values of $K$
Jul 8, 2019
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66
7 fishermen caught exactly 100 fish and no two had caught the same number of fish. Then there are three who have together captured at least 50 fish.
59
An illusionist and their assistant are about to perform the following magic trick
51
How to prove that $\sqrt{2+\sqrt3}-\sqrt{2-\sqrt3}=\sqrt2$ without squaring both sides
51
How do you correctly reason that this directed graph is acyclic?
47
What is the closed form of the $f$ with $f(1)=1$, $f(2)=7$ and $f(n)=7f(n-1)-12f(n-2)$ ($n\ge 3$)?